docs(readme): document Bandcamp track links

README.md

@@ -28,7 +28,8 @@ the public SomaFM endpoints and open protocols.
   Images are cached in `~/.cache/somafm-tui/artwork`.
 - **Now playing** — artist, title, album, DJ, listeners, format/bitrate and
   "played N minutes ago", with procedural ANSI-shaded album art that changes
-  per track.
+  per track. When the current track can be found on Bandcamp, a clickable
+  **Bandcamp ↗** link appears below it; otherwise the line stays hidden.
 - **Last played** — the full recent history from `somafm.com/songs/<id>.json`.
 - **Every station** — the whole `channels.json` roster (≈50 channels), live
   listener counts, genre search.
@@ -190,6 +191,9 @@ containers, …) MPRIS is skipped and the status bar shows `mpris off`.
   downsampling.
 - `somafm_tui/mpris.py` — `dbus-next` MPRIS service in its own thread with a
   thread-safe command queue back into the UI.
+- `somafm_tui/bandcamp.py` — searches Bandcamp's public autocomplete API for
+  the now-playing track (artist + track first, then artist + album, then the
+  album page) and returns a track URL when there is a match.
 - `somafm_tui/widgets/` — Textual widgets rendered with native ANSI colours;
   backgrounds are `ansi_default` (`SGR 49`), so transparent terminals stay
   transparent.